GARAGNANI, E.; UGUZZONI, F. A multiplicity result for a degenerate elliptic equation with critical growth on noncontractible domains. Topological Methods in Nonlinear Analysis, [S. l.], v. 22, n. 1, p. 53–68, 2003. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2003.027. Acesso em: 22 lip. 2024.